Vista normal
Vista MARC
- Sick, Helmut,
Sick, Helmut, 1910-1991 (Nombres de personas)
His Ornitologia brasileira, c1984: v. 1-2, t.p. (Helmut Sick)
LC data base, 10-1-85 (hdg.: Sick, Helmut, 1910- )
Ornitologia brasileira, 1997: t.p. (Helmut Sick) p. 11 (d. 03-05-91, in Rio de Janeiro)
Wikipedia, June 23, 2014 (Helmut Sick; b. January 10, 1910; d. March 5, 1991; was a German-Brazilian ornithologist)